webgpu: Implement Tqueries

filament/backend/CMakeLists.txt

@@ -262,6 +262,7 @@ if (FILAMENT_SUPPORTS_WEBGPU)
             src/webgpu/WebGPUSwapChain.cpp
             src/webgpu/WebGPUSwapChain.h
             src/webgpu/WGPUProgram.cpp
+            src/webgpu/WGPUTimerQuery.cpp
     )
     if (WIN32)
         list(APPEND SRCS src/webgpu/platform/WebGPUPlatformWindows.cpp)

filament/backend/src/webgpu/WGPUTimerQuery.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+#include "WebGPUHandles.h"
+
+#include <chrono>
+
+
+namespace filament::backend {
+
+void WGPUTimerQuery::beginTimeElapsedQuery(WGPUTimerQuery* query) {
+    query->status->elapsed = 0;
+    query->status->available.store(false);
+
+    // Capture the timer query status via a weak_ptr because the MetalTimerQuery could be destroyed
+    // before the block executes.
+    std::weak_ptr<WGPUTimerQuery::Status> status = query->status;
+
+    if (auto s = status.lock()) {
+        s->elapsed = std::chrono::steady_clock::now().time_since_epoch().count();
+    }
+
+    ;
+}
+
+void WGPUTimerQuery::endTimeElapsedQuery(WGPUTimerQuery* query) {
+    // Capture the timer query status via a weak_ptr because the WGPUTimerQuery could be destroyed
+    // before the block executes.
+    std::weak_ptr<WGPUTimerQuery::Status> status = query->status;
+    if (auto s = status.lock()) {
+        s->elapsed = std::chrono::steady_clock::now().time_since_epoch().count() - s->elapsed;
+        s->available.store(true);
+    }
+}
+
+bool WGPUTimerQuery::getQueryResult(WGPUTimerQuery* query, uint64_t* outElapsedTime) {
+    if (!query->status->available.load()) {
+        return false;
+    }
+    if (outElapsedTime) {
+        *outElapsedTime = query->status->elapsed;
+    }
+    return true;
+}
+
+}// namespace filament::backend